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INCOME TAXES: (Tables) | 6 Months Ended
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Jun. 30, 2025
INCOME TAXES: |
Schedule of income tax provision and effective income tax rate | The income tax provision and the effective income tax rate for the six-month period ended June 30, 2025 and 2024 consisted of (in millions):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024 | ​
Statutory income tax provision | ​ | $ | 930.0 | ​ | $ | 852.3 | ​
Peruvian royalty | ​ |  | 33.3 | ​ |  | 29.1 | ​
Mexican royalty | ​ |  | 94.7 | ​ |  | 75.7 | ​
Peruvian special mining tax | ​ |  | 50.7 | ​ |  | 45.0 | ​
Total income tax provision | ​ | $ | 1,108.7 | ​ | $ | 1,002.1 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Effective income tax rate | ​ | ​ | 36.7 | % | ​ | 37.3 | %

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- Definition Disclosure of the income tax provision attributable to continuing operations and the effective income tax rate. + References No definition available. + Details
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- References No definition available. + Details
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